Electronic Shift Module Internal

ELECTRONIC SHIFT MODULE INTERNAL

For a complete wiring diagram, Refer to the Wiring Information Electrical Diagrams

Theory of Operation

The Shift Lever Assembly (SLA) Electronic Shift Module (ESM) performs various internal tests to verify proper controller operation. This DTC indicates that there is an issue with the SLA internal processor.

- When Monitored:
Continuously with the ignition in the run position.

- Set Condition:
If the Shift Lever Assembly controller detects an invalid calibration (checksum value).





Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Transmission Pre-Diagnostic Troubleshooting Procedures
SHIFT LEVER ASSEMBLY

Repair

- Using the schematics as a guide, check the Shift Lever Assembly Control Module terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the Shift Lever Assembly.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test